disparity

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dis·par·i·ty

(dis-par'i-tē),
The condition of being disparate.
[L. dispar, dissimilar]

disparity

The condition of being unequal or totally different. The word is used mainly to refer to non-corresponding points in the retina. See retinal disparity; retinal corresponding points.
binocular disparity See stereoscopic visual acuity; retinal disparity; depth perception.
crossed disparity Retinal disparity induced by an object nearer to the eyes than the point of fixation and focused on the temporal retina. Thus, the image received by the right eye appears to the left and that received by the left eye appears to the right. Syn. crossed retinal disparity.
fixation disparity See retinal disparity.
retinal disparity Binocular vision in which the two retinal images of a single object do not fall on corresponding retinal points, i.e. when the object lies off the horopter. If, however, the two retinal images still fall within Panum's area, the object will still be seen single. At the fixation point this may cause over- or under-convergence of the eyes. This particular case is called fixation disparity (or retinal slip). The presence of fixation disparity often indicates that binocular vision is under stress and the patient has an uncompensated heterophoria. Optical correction or orthoptic exercises usually eliminate the symptoms. Fixation disparity can be measured either (1) directly (e.g. Disparometer, Wesson Fixation Disparity Card, both consisting of targets with pairs of vernier lines of various angular separation, each line being seen by one eye through polarizing filters), or (2) indirectly as an associated phoria (e.g. Mallett fixation disparity unit). Syn. binocular disparity. See stereoscopic visual acuity; anaglyph; esodisparity; exodisparity; fusional movements; depth perception; random-dot stereogram; stereopsis; stereotest.
uncrossed disparity Retinal disparity induced by an object farther away from the eyes than the point of fixation and focused on the nasal retina. Thus, the image received by the right eye appears to the right and that received by the left eye appears to the left. Syn. uncrossed retinal disparity.
vergence disparity See motor fusion.
References in periodicals archive ?
HEAA takes the most comprehensive approach to health disparities elimination by providing Federal resources, policies, and infrastructure to eliminate health disparities, with a focus on racial and ethnic minorities, and others that face additional barriers based on immigration status, age, disability, sex, sexual orientation, gender identity, and English proficiency.
Health care disparities have been measured using multiple methods and disparity definitions, including assessing differences in unadjusted means as is done in the National Health care Disparities Reports (AHRQ 2008b), interpreting race coefficients in models that increasingly add available covariates in a regression context (Fiscella et al.
The chapter authors investigate the underlying causes of health disparities in "Part II: Current Problems.
In contrast, women saw increases in college attainment, employment rate, and middle- and upper-income levels, all of which led to declining health disparities for females in this time period.
The Auditor General's report said that while it did not audit Maori health plans, it expected each DHB to report meaningfully on what the health disparities were in its district and how it had reduced them.
The American Hospital Association has joined the Association of American Medical Colleges, the American College of Healthcare Executives, Catholic Health Association of the United States and the National Association of Public Hospitals and Health Systems to create a national call to action to eliminate health care disparities.
The 2009 National Healthcare Quality Report provides a snapshot of how the nation is performing on 169 quality measures; the National Healthcare Disparities Report provides a summary of health care quality and access among various racial and ethnic groups and across income groups.
The 2009 National Healthcare Quality Report provides a snapshot of how the country is performing on 169 quality measures; the National Healthcare Disparities Report provides a summary of health care quality and access among various racial and ethnic groups, and across income groups.
The survey experiment was designed to tell for which type of health disparities the public would support government intervention.
Topics included recent or pending state and federal minority health legislation, community-based health disparities interventions and the use of the Patient-Centered Medical Home model to address health disparities, and reducing health disparities through cultural competency and health literacy.
To understand those disparities, Rachel Patzer, MPH, Sandra Amaral, MD, and colleagues at Emory University in Atlanta, GA, analyzed data from 1998 to 2002 of 35,346 patients in Georgia, North Carolina, and South Carolina suffering from end-stage renal disease (ESRD).